25354351481 has 2 divisors, whose sum is σ = 25354351482. Its totient is φ = 25354351480.

The previous prime is 25354351471. The next prime is 25354351513. The reversal of 25354351481 is 18415345352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20381845225 + 4972506256 = 142765^2 + 70516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25354351481 is a prime.

It is a super-2 number, since 2×25354351481² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25354351471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12677175740 + 12677175741.

It is an arithmetic number, because the mean of its divisors is an integer number (12677175741).

Almost surely, 2^25354351481 is an apocalyptic number.

It is an amenable number.

25354351481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25354351481 is an equidigital number, since it uses as much as digits as its factorization.

25354351481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288000, while the sum is 41.

The spelling of 25354351481 in words is "twenty-five billion, three hundred fifty-four million, three hundred fifty-one thousand, four hundred eighty-one".